Geometrical optimization of adhesive joints under tensile impact loads using cohesive zone modelling

• Published in: International journal of adhesion and adhesives 2020-03, Vol.97, p.102492, Article 102492
• Main Authors: Valente, J.P.A., Campilho, R.D.S.G., Marques, E.A.S., Machado, J.J.M., da Silva, Lucas F.M.
• Format: Article
• Language: English
• Subjects: Adhesive bonding; Adhesive joint; Adhesive joints; Adhesive strength; Chamfering; Cohesive zone models; Design modifications; Finite element method; Geometrical optimization; Impact loading; Impact loads; Impact strength; Lap joints; Optimization; Parameter modification
• ISSN: 0143-7496; 1879-0127
• DOI: 10.1016/j.ijadhadh.2019.102492

Industrial developments have led to an increasingly wide implementation of adhesive bonding. Due to the variability of adhesive bonding performance caused by different adhesive properties, it is necessary to validate Finite Element Method (FEM) tools. It is possible to increase the performance of adhesive joints when subjected to impact loadings, without making complex design changes, with the variation of geometric parameters or by modifying the adherends’ geometry. This work compares the results of different geometric changes applied to a single-lap joint (SLJ), when subjected to impact, through Cohesive Zone Models (CZM). Geometry modifications of the SLJ are made by introducing outer and inner chamfers into the adhesives, as well as adding adhesive fillets, to observe the effects of these modifications with different types of adhesives. The combination of the geometric changes that produce the best result is subsequently made. As a result of this work, the CZM technique was validated for the impact strength prediction of adhesive joints and the optimal joint geometries were defined as a function of the adhesive.